Background

The X68000 XVI HD and other HD computers all suffer from the same 2 main problem:

Bad power supply (due to blown capacitors and other failures)

Dead SRAM save battery

Assuming you did a full capacitor kit on the computer, replaced or fixed the power supply and installed a new save battery to store SRAM settings, you might still get a black screen on bootup. A good working X68000 will typically show the following screen: